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Magnesium alloy surface corrosion-resistant super-hydrophobic film layer and preparation method and application thereof

A magnesium alloy and super-hydrophobic technology, applied in the coating process of metal materials, coatings, etc., can solve problems such as complex processes and no anti-corrosion mechanism

Pending Publication Date: 2021-07-06
NINGBO INST OF MATERIALS TECH & ENG CHINESE ACADEMY OF SCI
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

For example: in the patent CN109881195A, a micro-nano structure film layer is constructed by immersing in an ethanol solution of 8-hydroxyquinoline, and then treated with 1H, 1H, 2H, 2H-perfluorooctyltriethoxysilane to prepare a micro-nanostructure film layer. Nano-superhydrophobic corrosion-resistant film; in the patent CN109989090A, micro-arc oxidation is used to construct a micron-scale pore-like structure on the surface of magnesium alloy, and then LDH treatment is performed at a high temperature to obtain a sheet-like nanostructure and modified, and finally lubricating oil is injected to obtain a super-hydrophobic film. It can be seen that the process of preparing superhydrophobic surface in previous reports is relatively complicated, and some substances harmful to the environment or human body are used, and the corresponding anti-corrosion mechanism has not been proposed. Therefore, a simple and effective method is used to prepare superhydrophobic surface with excellent performance. It is very important to study the corrosion-resistant surface and explore its anti-corrosion mechanism

Method used

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  • Magnesium alloy surface corrosion-resistant super-hydrophobic film layer and preparation method and application thereof
  • Magnesium alloy surface corrosion-resistant super-hydrophobic film layer and preparation method and application thereof
  • Magnesium alloy surface corrosion-resistant super-hydrophobic film layer and preparation method and application thereof

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preparation example Construction

[0028] An aspect of the embodiments of the present invention provides a method for preparing a corrosion-resistant super-hydrophobic film on the surface of a magnesium alloy, which includes:

[0029] Provide magnesium alloy as a substrate;

[0030] A layered double metal hydroxide film (MgAl-LDH film) with a micro-nano structure is formed on the surface of the substrate by a hydrothermal method, and the metal elements in the layered double metal hydroxide film include Al and Mg;

[0031] And, hydrophobizing treatment is performed on the obtained layered double metal hydroxide film, so as to prepare a corrosion-resistant super-hydrophobic film layer on the surface of the magnesium alloy.

[0032] In some more specific embodiments, the preparation method includes:

[0033] Disperse magnesium salt and aluminum salt in water to form a solution, then adjust the pH of the solution to 10-12, then add carbonate, and react at 70-90°C for 1-2 hours to obtain a magnesium-aluminum suspen...

Embodiment 1

[0075] (1) Use 400#, 800#, 1200#, 1500# SiC sandpaper to polish the surface of the magnesium alloy sample, then ultrasonically clean it in absolute ethanol for 10 minutes, and then dry it naturally in the air. / L of NaOH solution for 60s to remove the oxide layer on the surface, and then dry under atmospheric conditions;

[0076] (2) Synthesis of MgAl-LDH film:

[0077] 4.608g Mg(NO 3 ) 2 ·6H 2 O, 2.25g Al(NO 3 ) 3 9H 2 O was dispersed in deionized water and magnetically stirred under hydrothermal conditions, then 0.2 mol / L NaOH solution was added dropwise until the pH of the solution was 12, and then 0.318 g of NaOH was added 2 CO 3 , add deionized water to 300ml in the whole system, and place it in an oil bath at 80°C for 1h, then place it together with the magnesium alloy sample treated in step (1) in an autoclave for hydrothermal reaction (react at 130°C for 18h ); Finally, the prepared sample was taken out and rinsed with deionized water, and then dried at 65° C. ...

Embodiment 2

[0082] (1) Use 400#, 800#, 1200#, 1500# SiC sandpaper to polish the surface of the magnesium alloy sample, then ultrasonically clean it in absolute ethanol for 10 minutes, and then dry it naturally in the air. / L of NaOH solution for 60s to remove the oxide layer on the surface, and then dry under atmospheric conditions;

[0083] (2) Synthesis of MgAl-LDH film:

[0084] 4.608g Mg(NO 3 ) 2 ·6H 2 O, 2.25g Al(NO 3 ) 3 9H 2 O was dispersed in deionized water and magnetically stirred under hydrothermal conditions, then 0.2 mol / L NaOH solution was added dropwise until the pH of the solution was 12, and then 0.318 g of NaOH was added 2 CO 3 , add deionized water to 300ml in the whole system, and place it in an oil bath at 80°C for 1h, then place it together with the magnesium alloy sample treated in step (1) in an autoclave for hydrothermal reaction (react at 130°C for 18h ); Finally, the prepared sample was taken out and rinsed with deionized water, and then dried at 65° C. ...

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Abstract

The invention discloses a magnesium alloy surface corrosion-resistant super-hydrophobic film layer and a preparation method and application thereof. The preparation method comprises the following steps of forming a layered double-metal hydroxide film with a micro-nano structure on the surface of a substrate by adopting a hydrothermal method; and carrying out hydrophobization treatment on the obtained layered double-metal hydroxide film so as to obtain the magnesium alloy surface corrosion-resistant super-hydrophobic film layer. According to the preparation method of the magnesium alloy surface corrosion-resistant super-hydrophobic film layer, preparation can be directly conducted on the magnesium alloy, the treatment process is simple, preparation is convenient, the period is short, and the preparation technology is easy to achieve and environmentally friendly. Meanwhile, the magnesium alloy surface corrosion-resistant super-hydrophobic film layer prepared through the method has good hydrophobic performance, the corrosion resistance of the magnesium alloy can be remarkably improved, and good corrosion resistance can be kept for a long time. The invention provides a corrosion-resistant mechanism of the prepared corrosion-resistant film layer, and the corrosion-resistant film layer has wide application prospects in the fields of batteries, automobile industry or aerospace.

Description

technical field [0001] The invention belongs to the technical field of surface modification of metal materials, and in particular relates to a corrosion-resistant super-hydrophobic film layer on the surface of a magnesium alloy and a preparation method and application thereof. Background technique [0002] Magnesium and magnesium alloys have attracted much attention due to their low density, high strength, high modulus of elasticity, good heat dissipation, and high impact load capacity. They are widely used in batteries, the automotive industry, aerospace and other fields to reduce overall weight and energy consumption. However, magnesium alloys are easily corroded, which greatly limits their use, so controlling their corrosion is of great significance. In recent years, various methods to improve the corrosion resistance of magnesium alloys or protect magnesium alloys from corrosion have been reported, such as elemental alloying, homogeneous structure, polymer coating, plas...

Claims

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Application Information

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IPC IPC(8): C23C26/00
CPCC23C26/00
Inventor 蒲吉斌黄曼怡常可可
Owner NINGBO INST OF MATERIALS TECH & ENG CHINESE ACADEMY OF SCI
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